Taxonomic and phylogenetic studies on xylariaceae

Name: Daranagama, Dinushani Anupama

Organization : Mae Fah Luang University

keyword: Xylariaceae

LCSH: Plants -- Classification

Classification :.LCCS: QK95

LCSH: Phylogeny

Abstract: The family Xylariaceae, comprising over 1300 species, is considered as one of the largest families of the Ascomycota. Members of Xylariaceae exhibit a wide distribution and they are cosmopolitan. Certain genera of this family still lack comprehensive morphological studies or illustrations of the important characteristics, while morphological descriptions, molecular data and data on secondary metabolism are available for many widely distributed genera. Many genera included recently into this family are monotypic and even the monotypic genera introduced decades ago lack fresh collections. Some genera are only known from their type species from the type collection, which are now not available for study. The aim of this study was to infer the evolutionary relationships among the species of the Xylariaceae based on multigene analysis including protein coding genes and to construct a backbone tree for the family. Thus a reliable phylogenetic and taxonomic relationship was utilized and established a unified nomenclature for the genera by linking their asexual morphs with the respective sexual morphs. In order to achieve this purpose a molecular study based on the internal transcribed spacer (ITS), the large subunit (LSU) of the ribosomal RNA genes, the ß-tubulin gene (TUB) and the gene of the second-largest subunit of nuclear RNA Polymerase II (RPB2) was performed with a high number of reference strains for the first time in Xylariaceae history representing numerous genera. The resulted maximum likelihood and Bayesian trees of the combined genes were compared to each other as well as single gene trees were analyzed to follow the evolutionary patterns. The generated phylogram is highly supported compared to the recent studies and show well-resolute relationships within the Xylariaceae supported by morphology. This study confirms the assumed separation of the genus Anthostomella and shows that the genus consists of six lineages, comprising several genera within the family. This study provided an updated outline for the core Xylariaceae genera, which can easily follow in the future applications. The morphological characters are redefined and limited only to include true Xylariaceae species. A new family Lopadostomataceae is introduced in this study based on molecular and phylogenetic data and four genera are introduced to the family. Hypoxylaceae and Graphostromataceae have been studied in this study and provided an updated outline of genera. Another family similar to Xylariaceae, Amplistromataceae has been studied in this study. Genera that have uncertain morphological affinities with Xylariaceae are studied and tentatively placed into suitable families. As the final outcome, this study establishes a basis for the reformation of the generic and familial boundaries of Xylariaceae and other related families and depicts a benchmark on DNA based multigene phylogeny within the Xylariaceae. Number of reliable and authentic morphological and molecular data introduced in this study will serve as the backbone dataset for the upcoming studies.

Mae Fah Luang University

Address: CHIANG RAI

Email: library@mfu.ac.th

Name: Sunita Chamuang

Role: Advisor

Name: Kevin David Hyde

Role: Co-Advisor

Created: 2017

Issued: 2561

Modified: 2020-05-01

Issued: 2018-02-15

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Thesis QK95 D213t 2017

eng

DegreeName: Dotor of Philosophy

Level: Doctoral Degree

Descipline: Biosciences

Grantor: Mae Fah Luang University

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